No. But cause a lot of bothersome itching and are very contagious if you scratch and do not wash hands and scrub under nails. They come out at night and deposit eggs. When you scratch and dont have good hygeine the touch something eggs ate deposited. Someone else touches it the puts hands in mouth and the get the pin worms. The cycle continues. There are prescription medications to cure them.
No. Pinworms usually do not affect fertility.